Septic tank



F. E. WILSON Jan. '10, 1928.

SEPTIC TANK Filed Sept. 20. 1924 Patented Jan. 1Q, 1928;

UNITED STATES PATENT OFFICE,

FREDERICK WILSON, OI BUFFALO, NEW YORK.

' i SEPTIG ran 7 Application filed September 20, 1924'. Serial No 738,798.

This invention relates to sowagetreating formed between a battle E and a baffle F. apparatus of the kind connnonly known as The hal de E extends from the bottom A of septic tanks and in which the heavier and the tank to within a short distance of the lighter parts of the sewage are separated and top A of the tank A, while the battle F cx- E 5 undergo certain changes due to bacteriotends from the top of the baille E to a point logical action within the tank. preferably less than half way down the The objects o1 this invention are to pro tank. The inlet pipe 13 connects with a vide a septic tank which is so constructed vertical passage G similar to the passage D that the capacity of the tank may be utilized and formed between a bafliel-I and a bafiie J.

to the best advantage for the settling of the The baiiles H and J occupy the same vertical sewage and for the bacteriological action space in the tank as the bafiies E and F within the tank; also to provide a tank of respectively, so that the septic tank is rethiskind which is economical. to construct versible with respect to its inlet and dis and efficient in operation and the interior charge pipes. The battles E and H extend 15 of which is readily accessible for cleaning ohordally or diagonally across the tank, and out or for inspection; also to provide a septic are spaced apart to form a passage IQ thus tank which may be built and assembled in providing a circuitous and positive path of a factory and shipped completely tSSQ-lllblfifl, travel for the sewage between the inlet and so that no skilled mechanics are required at discharge pipes.

the place where the tank is installed} also to Owing to the fact that the bacteria which improvethe construction of septic tanks in bringabout the disintegration of the sewage other respects hereinafter specified. matter form a scum at the upper portion ol In the accompanying drawings: the tanln it is des1rable that the incoming 1 is a sectional elevation of the septic sewage should. beconducted to a part of the tank embodying my invention with parts tank below the scum so as not to interfere broken away to disclose the construction. with this scum, which is esscmtial to the Fig. 2 is transverse sectional View successful operation of the septic tank. The through the septic tank taken on line 1-4, passage G formed by the battle J is adapted Fi 1 to accomplish this result as the bathe J 'te rmii The septic tank embodying my invention nates slightlyabove the middle of the tank. is preferably cylindrical in form and tor The material, after passing downwardly this pru-posc is provided with a cylindrical through the 'iassage G' begins to travel m n A a: b tt all A and a top around the tank to the end of the battle H, wall A. Iutanks of this kind as heretothrough passage K, around the tank on the 'lore constructed, it was customary to permit outside of the ba'liic E and upwardly through the sewage to enter at one side of the tank passage I) to discharge pipe C, thus providand to be discharged from the other side ingthe longest possible path of travel for thereof. This arrangement of the inlet and the material. The tops of all baflies are outlet relatively to each. other causes the arranged above the level otthe'liquid so sewage to travel across the tank mainly in that no flow takes place on the surface and the shortest path, and consequently the parts the floating scum remains unbroken. Only of the tank at the sides of this pathare ot the liquid from the intermediate portion of very little use. In order to overcome this the tank adjacent the bottom of the hafile F objection, the following construction is pretis free to move upwardly in the passage D,

erahly employed. so that none of the scum with the essential The sewage enters into the tank through bacteria at the upper end of the tank can an inlet pipe B which is arranged at one side pass out of the discharge pipe C. In view thereof adjacent to the upper portion of the of the fact that the passage D is far removed tank. and the material discharged from the from the bottom of the tank, the lighter and b0 tank passes through a discharge pipe C, heavier particles in the sewage have an which connects with a vertical passage 1) ample opportunity to either pass to the upper surface of the liquid or sink to the bottom of the tank during the flow from the inlet pipe B to the discharge pipe C, and no material from the bottom of the tank containing essential bacteria will flow out of the discharge pipe C.

The septic tank is preferably provided in the upper wall A with a manhole or other opening L having a suitable cover M. This opening is preferably so located that the inlet passage G as well as adjacent passages are accessible for cleaning. Theseptic tank has the usual protective coating N on its inside above the water line to prevent corrosion of the metal by acids, ases and fatty i'naterials and this protective coating may be of any desired form.

The tank described has the advantage that it can be made of sheet metal and can be assembled at a factory ready to be placed into the ground, and the arrangement of the walls within the tank is such that full capacity of the tank is made use of to good advantage. The tank described separates the sewage very ell'ectively and is inexpensive to construct, and because of the means provided for the prevention of corrosion of the metal, the tank will last indefinitely. I claim as my invention 1. A septic tank comprising a casing having an inlet and outlet, said outlet determining the level of the liquid in said casing and opening into the casing at a point be low said level, bal'lle walls disposed in said casing and extending from opposite side walls across the interior of the casing but terminating in spaced relation to the wall. opposite to that from which it extends, both of said baffle walls crossing the direct path of flow between the inlet and outlet extending from a point well below the maximum level of liquid in said casing to a point above the maximum level whereby the liquid passing between the inlet and outlet in said casing will be conducted in a circuitous path. 2. A septic tank comprising a casing having' an inlet and outlet, said out-let determining the level of the liquid in said casing and 0])Ql1ll1g into the casing at a point below said level, baffle walls disposed in said casing and extending from opposite side walls across the interior of the casing but te 'minating in spaced relation to the wall, opposite to that from which it extends, both of said ballle walls crossing the direct path of flow between the inlet and outlet and extending from the bottom wall of the casing upwardly above the maximum level of the liquid in said casing, whereby the contents of the casing in passing between the inlet and outlet will be conducted in a circuitous path.

8. A septic tank comprising a casing having an inlet and an outlet in its lateral wall and spaced apart from one another peripherally of the casing, plates secured to opposite points of the side wall and extending into the interior of the casing and across the direct course of a liquid passing between the inlet and outlet, said walls extending from adjacent the bottom of the casing to a point well above the maximum liquid level in said casing, whereby a liquid entering the casing through said inlet will be conducted in a circuitous path to said outlet, and additional plates connected between the side walls at the opposite sides of the inlet and outlet from the first mentioned plates and said first plates points a short distance from their anchored edge, said additional plates extending from above the maximum level in said casing downwardly into the liquid, whereby the iug'oing liquid will meet the body of liquid in the casing at a point well below its surface, and the outgoing liquid will be removed from the casing at a point well below the upper level of the liquid.

4. A septic tank comprising an upright casing having inlet and outlet openings at approximately opposite portions of the lateral walls, and platessecured to the lateral walls of the casing at approximately opposite points and at the sides of the inlet and outlet and extending in opposite directions past one another as well as in spaced relation to one another, said plates extending from adjacent the bottom wall upwardly above the maximum level of liquid in the casing and terminating in spaced relation to the opposite part ofthe side wall, whereby liquid passing through the casing will be conducted in a circuitous path around the free vertical edges of said plates.

5. A septic tank comprising an upright casing having inlet and outlet openings at approximately opposite portions of the lateral walls, plates secured to the lateral walls of the casing at :uaproximately opposite points and at the sides of the inletand out let and extending in opposite directions past one another as well as in spaced relation to one another, said plates extending from adjacent the bottom wall upwardly above the maximum level of liquid in the casing and terminating in spaced relation to the oppo site part of the side wall, whereby liquid passing through the casing will be conducted in a circuitous path around the free vertical edges of said plates, and an additional plate connected between each of said first plates at a distance from its secured side edge to the lateral wall at the opposite side of the inlet or outlet from which that plate extends, said additional plates extending from above the maximum level of liquid in said casing to a point below the level, whereby the ingoing and outgoing liquid will not break the upper surface of liquid in said casing.

6. A septic tank comprising a casing having' an inlet and outlet, both opening into till the interior of the casing at points below the maximum level of liquid in the casing as de termined by the outlet, and battle plates secured to the lateral Wall of the casing and exte'miling across the path ot direct. How hetwoen the inlet and outlet, h-om opposite sides of the casing in spaced relation past.

one another, said plates being formed to permit passage of a liquid from face to face atstaggered points at opposite sides of the casing, whereby it liquid passing through said casing between the inlet and outlet will be vonllucted in u circuitous path.

FREDERICK E. YVILSON. 

